Archimedean spiral

Study of Archimedean Spiral Method for Testing Thermoplastics Fluidity

塑料流动性能的阿基米德螺线测定法研究

The moment method analysis of the plane Archimedean spiral antenna

平面阿基米德螺旋天线的矩量法分析

Analysis of Archimedean spiral antenna using moment method with curved segmentations

曲线分段的矩量法分析阿基米德平面螺旋天线

Analysis and design of a new-type planar Archimedean spiral antenna

一种新型平面阿基米德螺旋天线的分析与设计

A New Low Profile Archimedean Spiral Antenna

一种新型的低剖面阿基米德螺旋天线

Study on a Miniaturized Meander Archimedean Spiral Antenna

曲折臂形式的阿基米德螺旋天线小型化研究

A new-type planar Archimedean spiral antenna , the zigzag planar Archimedean spiral antenna , is presented .

对一种新型的平面阿基米德螺旋天线&锯齿状平面阿基米德螺旋天线进行了研究。

With the plane Archimedean spiral antenna a calculation of the current on the antenna as well as its radiation is carried out and its frequency independence was verified .

并以平面阿基米德螺旋天线为例，计算了天线上的电流分布和辐射特性，验证了天线的频率无关特性。

The spiral structure of heat exchanger was described as Archimedean spiral . The relation between the angular momentum and the flow of fluid in the spiral passage of this structure in the situation steadily was found .

本文选择采用等速螺线描述螺旋板式换热器截面的螺旋结构，计算了流体稳定流动情况下，此结构的螺旋通道内流体旋转角动量与流体流量之间的函数关系。

In this paper , Archimedean spiral antenna is analyzed using a mixed potential integral equation , and the equation is solved by the moment method incorporating with curved piecewise triangle sub-domain basis and pulse testing functions .

从混合位积分方程出发，采用矩量法结合曲线分段的三角基函数和脉冲检验函数分析了阿基米德平面螺旋天线，给出了输入阻抗，电流分布以及辐射方向图结果。

The principle , method and tool to determine the fluidity of thermoplastics using Archimedean spiral method are introduced . In addition , the factors influencing injection molding coefficient are introduced , which can provide practical process with reference as well .

主要介绍阿基米德螺旋线法测定热塑性塑料流动性能的原理、测定方法和工具，对注射成型系数的影响因素进行了探讨，可供指导生产实践参考。

The mathematical model was verified in experiment with the method of indirect squeeze cast Archimedean spiral proof sample . And the experimental results show that the maximum deviation between the theoretical value and measured value is less than 8 % .

采用间接挤压铸造阿基米德螺旋线试样的方法对该数学模型进行了实验验证，实验结果表明：理论计算值与实验测定值之间的最大偏差小于8%；

On basis of that , a tri-band circularly polarized microstrip antenna with laminated structure and multi fed geometry has been developed , as well as a planar self-complementary Archimedean spiral antenna and its balun .

在此研究基础上分别设计了一款叠层多馈形式的三频段圆极化微带贴片天线及一款平面自互补结构阿基米德螺旋天线及其平衡馈电巴伦。

The measured results agree well with simulated ones . The measured results show that the Archimedean spiral antenna is of wide beam-width and circular polarization . In addition , the measured results show that this design method is valid and it can be applied .

测试数据说明该天线的测试结果和仿真分析结果吻合良好，该设计方法是有效可行的，并可以推广到工程应用中。

UHF-band Archimedean spiral antenna with wide beam-width and circular polarization is designed . Firstly , UHF-band crossing dipoles circular polarization antennas fed with two type forms are presented : one is coaxial feed , another is a combination of lumped microstrip line-fed method .

文中首先研究了UHF频段圆极化十字交叉振子天线及其两种馈电方式：一种是同轴线馈电，另一种是微带线结合集总参数馈电的方法。

Design and Analysis of Self-Compensated Archimedean Plane Spiral Antenna

自补型阿基米德平面螺旋天线的设计与分析